[omnibox] [bookmark-paths] Add no-op feature, params, & flag.

Currently, bookmark suggestions are limited to title & URL matches. E.g
the input 'planets jupiter' won't suggest a bookmark titled 'jupiter' in
a directory 'planets'.

This is the 1st of 3 CLs implementing bookmark-paths which will allow
inputs to match bookmark paths (without contributing to the bookmark
suggestion's score).

This CL creates 4 params that will support 5 planned UI variations:
1) Title - URL (current behaviour)
2) Title - Path
3) Title : Path - URL
4) Path/Title - URL
5) Title - Path|URL (either path or URL depending on which matched the
input; favor path if both or neither matched the input)

Bug: 1129524
Change-Id: Iba575d8fc7db2fcb8ec9bd9b8c384dac83eaba1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416931
Reviewed-by: Tommy Li <[email protected]>
Commit-Queue: manuk hovanesian <[email protected]>
Cr-Commit-Position: refs/heads/master@{#812784}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index b3bc5b8..07181216 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -861,6 +861,9 @@
 extern const char kOmniboxAssistantVoiceSearchName[];
 extern const char kOmniboxAssistantVoiceSearchDescription[];
 
+extern const char kOmniboxBookmarkPathsName[];
+extern const char kOmniboxBookmarkPathsDescription[];
+
 extern const char kOmniboxClobberTriggersContextualWebZeroSuggestName[];
 extern const char kOmniboxClobberTriggersContextualWebZeroSuggestDescription[];